Question

use the given trigonometric identity to set up a u-substitution and then evaluate the indefinite integral: (intergal of) 4cos^2x dx, with the identity cos2x=1-2cos^2x

Answer 1

@mulline hi :)
\(\huge \color{red}{\text{Welcome to Open Study}}\ddot\smile\)

from cos2x=1-2cos^2x
try to isolate cos^2 x.

Answer 2

Thanks I totally get it now!

Answer 3

ohh, good :)

Answer 4

can you help me with this one

Answer 5

yeah, you can use, \(a^2-b^2 = (a+b)(a-b)\)
here, a = cos^2x , b = sin^2 x

Answer 6

and use the fact that : \(\sin^2x+\cos^2x=1\)

Answer 7

youre a genius.

Answer 8

not actually :P
math identities are genius :)